Laser Focus World is an industry bedrock—first published in 1965 and still going strong. We publish original articles about cutting-edge advances in lasers, optics, photonics, sensors, and quantum technologies, as well as test and measurement, and the shift currently underway to usher in the photonic integrated circuits, optical interconnects, and copackaged electronics and photonics to deliver the speed and efficiency essential for data centers of the future.

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Editorial Advisory Board

  • Professor Andrea M. Armani, University of Southern California
  • Ruti Ben-Shlomi, Ph.D., LightSolver
  • James Butler, Ph.D., Hamamatsu
  • Natalie Fardian-Melamed, Ph.D., Columbia University
  • Justin Sigley, Ph.D., AmeriCOM
  • Professor Birgit Stiller, Max Planck Institute for the Science of Light, and Leibniz University of Hannover
  • Professor Stephen Sweeney, University of Glasgow
  • Mohan Wang, Ph.D., University of Oxford
  • Professor Xuchen Wang, Harbin Engineering University
  • Professor Stefan Witte, Delft University of Technology

Engine Technology Forum Statement on EPA Announcement Regarding Diesel Exhaust Fluid (DEF) and Engines, Vehicles, and Equipment Using Advanced Emissions Controls

Washington, D.C., Aug. 12, 2025 (GLOBE NEWSWIRE) -- The Engine Technology Forum issued the following statement from Allen Schaeffer, Executive Director, on the announcement from the U.S. Environmental Protection Agency (EPA) of new guidance on Diesel Exhaust Fluid (DEF) for certain engines, vehicles, and equipment.

“EPA has heard from users of diesel trucks, tractors, and equipment and, working with manufacturers, has responded with these adjustments to improve operational performance while ensuring emissions integrity.

“Diesel engines are the workhorse of our economy, powering more than 90% of all commercial vehicles on the highway and more than three quarters of the machines and equipment used in the non-road sector such as agriculture, construction, power generation, and other applications.

“Since 2010 for highway vehicles and 2014 for most non-road equipment, achieving near-zero emissions of particulate matter and nitrogen oxides in these engines is accomplished by an advanced emissions control system known as selective catalytic reduction (SCR). To ensure emissions system integrity, uninterrupted performance, and clean air benefits, maintaining systems is key and this includes the replenishment of diesel exhaust fluid as well as being attentive to indicators and inducements within a certain timeframe.

“EPA’s announcement today provides new guidance that allows manufacturers to adjust these systems to ensure that farmers, motor coach operators, and truckers who all rely on diesel engines and equipment will be able to complete critical work with sufficient lead time for scheduling maintenance and repairs.”  

For more information visit: https://enginetechforum.org/about-us.

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About the Engine Technology Forum
Founded on the principles of fact-based education, science, outreach and collaboration, the Engine Technology Forum is dedicated to promoting a greater understanding of the benefits of advanced engines and the fuels that they use, as well as how these contribute to a sustainable future. Sign up for our digital newsletter and connect with us on LinkedInXFacebookInstagram, and YouTube.


Allen Schaeffer
Engine Technology Forum
3015149046
aschaeffer@enginetechforum.org
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